Writing to an array

[bra...@southbendcodeschool.com]

I want to keep an array at the root of my database.

/active_things

   - thing_id: true

   - thing_id2: true

elsewhere, there is already a relationship between thing and owner.  I just want to add an array entry to active_things when I create a Thing.  I'm not clear how to model this for emberfire.  Any tips, or is there a way I can just straight-up write a key/value pair to active_things?

[bra...@southbendcodeschool.com]

is it possible to get an emberfire reference to the root of the database?

[Tim Stirrat]

Hi Brandon,

Yes, you can get a ref to the root by using the firebase service:

firebase: Ember.inject.service(),

someMethod() {

  const ref = this.get('firebase');

}

As for the initial question, if you were happy to move the "array" location down a few levels in the firebase DB, you could use a singleton EmberFire model:

// app/models/thing-collection.js

export default Ember.Model.extend({

  activeThings: DS.hasMany('thing', {async: true})

});

Then you would always fetch the singleton thingCollection with id '1' and this can be your source of truth:

model() {

  return this.store.findRecord('thingCollection', '1');

},

actions: {

  someAction() {

    this.store.createRecord('thing', {x: 'y'})

      .save()

      .then((r) => {

        const model = this.get('model');

        model.get('activeThings').pushObject(r);

        return model.save();

      });

  }

}

If you really don't want to do that, you could use a raw ref and listen to the 'child_added', 'child_removed' events and pump this into an Ember array manually:

const activeThings = Ember.A();

ref.on('child_added', (snap) => {

  const id = snap.key();

  this.store.findRecord('thing', id).then(t => activeThings.pushObject(t));

});

ref.on('child_removed', (snap) => {

  const id = snap.key();

  // if peekRecord finds it, no need to findRecord again

  const thing = this.store.peekRecord('thing', id);

  if (thing) {

    activeThings.removeObject(t);

  }

});

Hope that gives you some ideas to work with,

🔥

Tim

On Mon, May 23, 2016 at 6:58 AM <bra...@southbendcodeschool.com> wrote:

is it possible to get an emberfire reference to the root of the database?

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